| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every few days | 23 | 
                                    
                                    8.5%
                                 | 
| 2 | Every few weeks | 37 | 
                                    
                                    13.7%
                                 | 
| 3 | Every few months | 102 | 
                                    
                                    37.6%
                                 | 
| 4 | Not at all | 109 | 
                                    
                                    40.2%
                                 | 
| Sysmiss | 48 |